High-frequency filter
US6798319B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 2, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Oct 2, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2013
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A high-frequency filter for use in a superhigh frequency band such as of microwaves and millimeter waves has a substrate, a metal conductor disposed on a first main surface of the substrate, a resonator comprising a transmission line of a coplanar structure which is made of the metal conductor, and input and output lines disposed on a second main surface of the substrate transversely across the resonator and electromagnetically coupled to the resonator. The resonator may be a coplanar line resonator (coplanar waveguide resonator) or a slot line resonator. The high-frequency filter has a steep attenuating gradient in filter characteristics. The high-frequency filter may be combined with variable-reactance devices such as variable-capacitance diodes for electronically controlling the filter characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.